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   1 #ifndef TREE_WALK_H
   2 #define TREE_WALK_H
   3
   4 struct name_entry {
   5         const unsigned char *sha1;
   6         const char *path;
   7         unsigned int mode;
   8 };
   9
  10 struct tree_desc {
  11         const void *buffer;
  12         struct name_entry entry;
  13         unsigned int size;
  14 };
  15
  16 static inline const unsigned char *tree_entry_extract(struct tree_desc *desc, const char **pathp, unsigned int *modep)
  17 {
  18         *pathp = desc->entry.path;
  19         *modep = desc->entry.mode;
  20         return desc->entry.sha1;
  21 }
  22
  23 static inline int tree_entry_len(const struct name_entry *ne)
  24 {
  25         return (const char *)ne->sha1 - ne->path - 1;
  26 }
  27
  28 void update_tree_entry(struct tree_desc *);
  29 void init_tree_desc(struct tree_desc *desc, const void *buf, unsigned long size);
  30
  31 /*
  32  * Helper function that does both tree_entry_extract() and update_tree_entry()
  33  * and returns true for success
  34  */
  35 int tree_entry(struct tree_desc *, struct name_entry *);
  36
  37 void *fill_tree_descriptor(struct tree_desc *desc, const unsigned char *sha1);
  38
  39 struct traverse_info;
  40 typedef int (*traverse_callback_t)(int n, unsigned long mask, unsigned long dirmask, struct name_entry *entry, struct traverse_info *);
  41 int traverse_trees(int n, struct tree_desc *t, struct traverse_info *info);
  42
  43 enum follow_symlinks_result {
  44         FOUND = 0, /* This includes out-of-tree links */
  45         MISSING_OBJECT = -1, /* The initial symlink is missing */
  46         DANGLING_SYMLINK = -2, /*
  47                                 * The initial symlink is there, but
  48                                 * (transitively) points to a missing
  49                                 * in-tree file
  50                                 */
  51         SYMLINK_LOOP = -3,
  52         NOT_DIR = -4, /*
  53                        * Somewhere along the symlink chain, a path is
  54                        * requested which contains a file as a
  55                        * non-final element.
  56                        */
  57 };
  58
  59 enum follow_symlinks_result get_tree_entry_follow_symlinks(unsigned char *tree_sha1, const char *name, unsigned char *result, struct strbuf *result_path, unsigned *mode);
  60
  61 struct traverse_info {
  62         const char *traverse_path;
  63         struct traverse_info *prev;
  64         struct name_entry name;
  65         int pathlen;
  66         struct pathspec *pathspec;
  67
  68         unsigned long df_conflicts;
  69         traverse_callback_t fn;
  70         void *data;
  71         int show_all_errors;
  72 };
  73
  74 int get_tree_entry(const unsigned char *, const char *, unsigned char *, unsigned *);
  75 extern char *make_traverse_path(char *path, const struct traverse_info *info, const struct name_entry *n);
  76 extern void setup_traverse_info(struct traverse_info *info, const char *base);
  77
  78 static inline int traverse_path_len(const struct traverse_info *info, const struct name_entry *n)
  79 {
  80         return info->pathlen + tree_entry_len(n);
  81 }
  82
  83 /* in general, positive means "kind of interesting" */
  84 enum interesting {
  85         all_entries_not_interesting = -1, /* no, and no subsequent entries will be either */
  86         entry_not_interesting = 0,
  87         entry_interesting = 1,
  88         all_entries_interesting = 2 /* yes, and all subsequent entries will be */
  89 };
  90
  91 extern enum interesting tree_entry_interesting(const struct name_entry *,
  92                                                struct strbuf *, int,
  93                                                const struct pathspec *ps);
  94
  95 #endif